By CLAY BAILEY Associated Press MEMPHIS, Tenn. (AP) — Jayson Tatum had 25 points and 14 rebounds, Al Horford scored 26 points and the Boston Celtics swept a six-game road trip for the first time in franchise history with a 117-103 win over the Memphis Grizzlies on Monday night. Victories at Utah, Portland, Sacramento, Phoenix, San Antonio and Memphis eclipsed the previous road win streak of five in February 1973. The run also helped Boston tie a franchise record with 32 road wins, accomplished in 1972-73 and 1974-75) and trailing Chicago (33, 1995-96) and Golden State (34, 2015-16). Kristaps Porzingis added 19 points as Boston won its ninth straight and closed out a 13-1 March. Ja Morant scored